Add a keycode to switch audio tracks (2/2)

A key to switch audio tracks is general on media devices like blu-ray.

Bug: 9728155
Change-Id: I13ebbc64321f3cf10370f9a605f3d94ea0d16d6d
diff --git a/include/input/KeycodeLabels.h b/include/input/KeycodeLabels.h
index c76ba12..c64c5d8 100644
--- a/include/input/KeycodeLabels.h
+++ b/include/input/KeycodeLabels.h
@@ -246,6 +246,7 @@
     { "ASSIST", 219 },
     { "BRIGHTNESS_DOWN", 220 },
     { "BRIGHTNESS_UP", 221 },
+    { "MEDIA_AUDIO_TRACK", 222 },
 
     // NOTE: If you add a new keycode here you must also add it to several other files.
     //       Refer to frameworks/base/core/java/android/view/KeyEvent.java for the full list.